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@article{DAN_1969_185_3_a2, author = {V. V. Velichenko}, title = {The invariance of discrete systems}, journal = {Doklady Akademii Nauk}, pages = {503--506}, publisher = {mathdoc}, volume = {185}, number = {3}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a2/} }
V. V. Velichenko. The invariance of discrete systems. Doklady Akademii Nauk, Tome 185 (1969) no. 3, pp. 503-506. http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a2/